United States. Bureau of Labor Statistics. "Digest of 100 Selected Pension Plans Under Collective Bargaining, Late 1964 : Bulletin of the United States Bureau of Labor Statistics, No. 1435," Digest of 50 Selected Pension Plans for Salaried Employees (1965). https://fraser.stlouisfed.org/title/4696/item/498037, accessed on January 23, 2025.